There may be cases where you would like participants to be able to register multiple times with the same email address, e.g., an event where participants can register family members accompanying them.
By default, email addresses are validated on whether they are unique or not, and participants trying to register with an email address that already exists are not able to do so.
In order to allow multiple registrations with the same email address, navigate to your Event Dashboard, then to the Settings tab and expand the Unique email validation section. Check the "No validation on unique email addresses" radio button and click Save.
Once you're done, participants filling in the registration form or your Azavista users will be able to add a participant to this event with an email address that has been registered before.